RadeonSI Resorts To Disabling SDMA For GFX9/Vega Due To APU Issues

[aufkrawall]

The effect on games by disabling it for Polaris was close to non-existent in my own tests while it got rid of nasty corruption throughout the bank. If the same is true for this case as well, this would be a welcome change. Let's see this through pragmatic goggles.

[bezirg]

It would be nice if Michael can spin up a benchmark for the effects of this change. Also does this bug affect renoir apus as well?

[wizard69]

Well that sucks. If this is an APU only issue why not disable the feature just on those platforms?

[phoronix]

Phoronix: RadeonSI Resorts To Disabling SDMA For GFX9/Vega Due To APU Issues

AMD's RadeonSI Gallium3D driver has resorted to disabling SDMA (System DMA) async DMA engine support for all GFX9/Vega hardware due to issues plaguing some APUs...

http://www.phoronix.com/scan.php?page=news_item&px=RadeonSI-Disables-GFX9-SDMA